Valence structures and magnetic interactions of 1-D mixed-metal complexes, [Ni1-xPdxX(chxn)(2)]X-2 (0.0 <= x <= 1.0, chxn = (1R,2R)-diaminocyclohexane, X = Cl, Br) studied by N-15 solid-state NMR

Kimura N; Tanaka M; Shimizu T; Ikeda R

Chemical Physics Letters, Vol.610, 401-404, 2014

DOI10.1016/j.cplett.2014.07.072 Export Citation

Valence structures and magnetic interactions of 1-D mixed-metal complexes, [Ni1-xPdxX(chxn)(2)]X-2 (0.0 <= x <= 1.0, chxn = (1R,2R)-diaminocyclohexane, X = Cl, Br) studied by N-15 solid-state NMR

Kimura N, Tanaka M, Shimizu T, Ikeda R

We performed natural-abundance N-15 NMR spectroscopy measurements on 1-D mixed-metal complexes, [Ni1-xPdxX(chxn)(2)]X-2 (0.0 <= x <= 1.0, chxn = (1R,2R)-diaminocyclohexane; X = Cl, Br). The spectra obtained for 15N bonded directly not only to Pd2+ and Pd4+, but also to Pd3+, and Ni3+ could be separated from each other more clearly than those obtained previously through C-13 NMR measurements. From the results obtained, a spin structure model in which several Pd2+ and Pd4+ sites next to Ni3+ sites in 1-D chains are converted into paramagnetic Pd3+ was shown, and the conversion ratio into Pd3+ was estimated. (C) 2014 Elsevier B.V. All rights reserved.